- K-Ci – Cedric Hailey
- K'Maro – Cyril Kamar (Lebanese-Canadian rapper)
- Ya Kid K – Barbara Kamosi Maoso Duogi
- Takeshi Kaga – Shigekatsu Katsuda (both names rendered in Western order)
- Madeline Kahn – Madeline Gail Wolfson
- Tiny Kahn – Norman Kahn
- Carole Kai – Carole Shimizu
- Musa Kaleem – Orlando Wright
- Kalel – Michael Richard Wittig
- Mindy Kaling – Vera Mindy Chokalingam
- Kitty Kallen – Genevieve Agostinello
- Kane – Glenn Thomas Jacobs
- Big Daddy Kane – Antonio Harding
- Helen Kane – Helen Schroder
- Sharon Kane – Sharon Louise Cain
- James Karen – James Karnufsky
- Anna Karina – Hanne Karin Blarke Bayer
- Miriam Karlin – Miriam Samuels
- Boris Karloff – William Henry Pratt
- Mick Karn – Anthony Michaelides
- Richard Karn – Richard Karn Wilson
- Maria Karnilova (a.k.a. Maria Karniloff) – Maria Dovgolenko
- Fred Karno – Frederick John Westcott
- Shizuko Kasagi – Shizuko Kamei
- Casey Kasem – Kemal Amin Kasem
- Anna Kashfi – Johanna O'Callaghan
- Philippe Katerine – Philippe Blanchard
- Katherine Kath – Lily Faess
- Andreas Katsulas – Andrew Katsulas
- Beatrice Kay (a.k.a. Honey Kuper, Honey Day) – Hannah Beatrice Kuper
- Crystal Kay (a.k.a. Kuri(-chan), CK) – Crystal Kay Williams
- John Kay – Joachim Fritz Krauledat
- Kelly Kay – Kelly Kershaw
- Lesli Kay (akas: Lesli Kay Coulouris; Lesli Kay Sterling) – Lesli Kay Pushkin
- Danny Kaye – David Daniel Kaminsky
- Sammy Kaye – Samuel Zarnocay
- Stubby Kaye – Bernard Kotzin
- Thorsten Kaye – Thorsten Ernst Kieselbach
- Elia Kazan – Elias Kazanjoglou
- Lainie Kazan – Lainie Levine
- Staci Keanan – Anastasia Sagorsky
- Buster Keaton – Joseph Frank Keaton (later changed to Joseph Francis Keaton)
- Diane Keaton – Diane Hall
- Michael Keaton – Michael John Douglas
- Myra Keaton – Myra Edith Cutler
- Howard Keel – Harold Clifford Leek
- Ruby Keeler – Ethel Hilda Keeler
- Maynard James Keenan – James Herbert Keenan
- Garrison Keillor – Gary Edward Keillor
- Andrew Keir – Andrew Buggy
- Brian Keith – Robert Alba Keith
- Robert Keith – Rolland Keith Richey
- Ian Keith – Keith Ross
- Penelope Keith – Penelope Anne Constance Hatfield
- Toby Keith – Toby Keith Covel
- Angel Kelly – Pamela Moore
- Judy Kelly – Julie Aileen Kelly
- Kelly Kelly – Barbara Jean Blank
- R. Kelly – Robert Sylvester Kelly
- Ed Kemmer – Edward William Kemmerer
- Dame Madge Kendal – Margaret Shafto Robertson
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- Tony Kendall – Luciano Stella
- Emma Kennedy – Elizabeth Emma Williams
- Jayne Kennedy – Jane Harrison
- Merna Kennedy – Maude Kahler
- Mr. Kennedy (aka "Mr. Anderson") – Kenneth Anderson
- Tom Kennedy – James Edward Narz
- Barbara Kent – Barbara Cloutman (original surname previously misspelled as Klowtman or Klowtmann in reference material)
- Jean Kent – Joan Mildred Summerfield
- Paula Kent – Paula Jane Baer
- Joanna Kerns – Joanne Crussie DeVarona
- Anita Kerr – Anita Jean Grilli
- Deborah Kerr – Deborah Jane Kerr-Trimmer
- Norman Kerry – Arnold Kaiser
- cevin Key – Kevin Crompton
- T'Keyah Crystal Keymáh – Crystal Walker
- Alicia Keys – Alicia Augello Cook
- Wael Kfoury – Michel Emile Kfoury
- Wiz Khalifa – Cameron Jibril Thomaz
- Chaka Khan – Carole Yvette Marie Stevens
- Rajesh Khanna - Jatin Khanna
- Twinkle Khanna - Tina Khanna
- The Kid – Mark Ryan
- Kid Creole – August Darnell
- Kid Rock – Robert Ritchie
- Michael Kidd – Milton Greenwald
- Udo Kier – Udo Kierspe
- Killa Cam – Cameron Giles
- Killa Kela – Lee Potter
- Andy Kim – Andrew Youakim
- Lil' Kim – Kimberly Denise Jones
- Sandra Kim – Sandra Caldarone
- Alan King – Irwin Alan Kniberg
- Albert King – Albert Nelson
- Andrea King – Georgette André Barry
- Anita King – Anna Keppen
- Ash King – Ashutosh Ganguly
- B.B. King – Riley B. King
- Ben E. King – Benjamin Earl Nelson
- Carole King – Carole Klein
- Earl King – Earl Silas Johnson IV
- Freddie King – Frederick Christian
- Kip King – Jerome Kattan
- Larry King – Lawrence Harvey Zeiger
- Mabel King – Donnie Mabel Elizabeth Washington
- Morgana King – Maria Grazia Morgana Messina
- Pee Wee King – Julius Frank Anthony Kuczynski
- Sonny King (singer) – Luigi Antonio Schiavone
- Zalman King – Zalman King Lefkowitz
- King Africa – Alan Duffy
- King Diamond – Kim Bendix Petersen
- King Kolax – William Little
- King Pleasure – Clarence Beeks
- Sir Ben Kingsley – Krishna Pandit Banji
- Kofi Kingston – Kofi Sarkodie-Mensah
- Natalie Kingston – Natalie (or Natalia) Ringstrom
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- Sean Kingston – Kisean Jamal Anderson
- Kathleen Kinmont – Katheen Kinmont Smith
- Klaus Kinski – Nikolaus Karl Günther Nakszyński
- Nastassja Kinski – Nastassja Aglaia Nakszyński
- Bruce Kirby – Bruno Giovanni Quidaciolu
- Bruno Kirby – Bruno Giovanni Quidaciolu, Jr.
- Phyllis Kirk – Phyllis Kirkegaard
- Kish – Andrew Kishino
- Katie Kissoon – Kathleen Farthing
- Johnny Kitagawa – Hiromu Kitagawa
- Kitaro – Masanori Takahashi
- Eartha Kitt – Eartha Mae Keith
- Alisha Klass – Alicia Lynn Pieri
- Evel Knievel – Robert Craig Knievel
- Beverley Knight – Beverley Anne Smith
- Evelyn Knight – Evelyn Davis
- Fuzzy Knight – John Forrest Knight
- June Knight – Margaret Rose Valliquietto
- Patricia Knight – Marjorie Heintzen
- Ted Knight – Tadeusz Wladyslaw Konopka
- Dr. Know – Gary Wayne Miller
- Patric Knowles – Reginald Lawrence Knowles
- Barbara Knox – Barbara Brothwood
- Elyse Knox – Elsie Lillian Kornbrath
- Johnny Knoxville – Phillip John Clapp
- Ruth Kobart – Ruth Maxine Kahn
- Oja Kodar – Olga Palinkaš
- Kon Artis – Denaun Porter
- Kool – Robert Bell
- Kool Keith – Keith Matthew Thornton
- Kool Moe Dee – Mohandas Dewese
- Andrei Konchalovsky – Andron Sergeyevich Mikhalkov
- Sir Alexander Korda – Sándor László Kellner
- Véra Korène – Rébecca Véra Korestzky
- Alexis Korner – Alexis Andrew Nicholas Koerner
- Fritz Kortner – Fritz Nathan Kohn
- Sylva Koscina – Sylva Koskinon
- Harley Jane Kozak – Susan Jane Kozak
- Kidd Kraddick – David Peter Cradick
- Jane Krakowski – Jane Krajkowski
- Billy J. Kramer – William Ashton
- Krayzie Bone – Anthony Henderson
- Marta Kristen – Birgit Annalisa Rusanen
- Chad Kroeger – Chad Robert Turton
- KRS-One – Lawrence Krisna Parker
- Diane Kruger – Diane Heidkrüger
- Kujira – Wakako Matsumoto
- Ashok Kumar – Kumudlal Kanjilal Ganguly
- Dilip Kumar – Yusuf Khan
- Kishore Kumar – Abhas Ganguly
- Meena Kumari – Mahjabeen Bano
- Kuniva (a.k.a. Hanz G and Rondell Beene) – Von Carlisle
- Kurious (a.k.a. Kurious Jorge) – Jorge Alvarez
- Susumu Kurobe (a.k.a. Susume Kurobe) – Takashi Yoshimoto
- Kurupt – Ricardo Brown
- Stanley Kwan – Jinpang Guan
- Kay Kyser – James Kern Kyser
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